Fix GPIO widget

[steveatinfincia]

This bug is not in the GPIO widget itself but partly a bug in the microservice code, and partly a result of the way various parts of the QOpenHD app learn the IP address of the ground station.

When running on the ground station, the settings system in OpenHD never sends "hello" messages to let the app know what the ground IP address is, because that process is triggered by joining the hotspot and therefore never occurs on the ground station itself.

To fix that, we will manually trigger the IP update event in QOpenHD's settings class, which will cause the rest of the system to work normally.

The part of this bug that is in the microservice code is simply a few missing parenthesis.